Initial import of modified Linux 2.6.28 tree

Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y

1 files changed, 280 insertions, 0 deletions

diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c
new file mode 100644
index 0000000..c63de0a
--- /dev/null
+++ b/net/ipv4/xfrm4_policy.c
@@ -0,0 +1,280 @@
+/*
+ * xfrm4_policy.c
+ *
+ * Changes:
+ *	Kazunori MIYAZAWA @USAGI
+ * 	YOSHIFUJI Hideaki @USAGI
+ *		Split up af-specific portion
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/inetdevice.h>
+#include <net/dst.h>
+#include <net/xfrm.h>
+#include <net/ip.h>
+
+static struct dst_ops xfrm4_dst_ops;
+static struct xfrm_policy_afinfo xfrm4_policy_afinfo;
+
+static struct dst_entry *xfrm4_dst_lookup(int tos, xfrm_address_t *saddr,
+					  xfrm_address_t *daddr)
+{
+	struct flowi fl = {
+		.nl_u = {
+			.ip4_u = {
+				.tos = tos,
+				.daddr = daddr->a4,
+			},
+		},
+	};
+	struct dst_entry *dst;
+	struct rtable *rt;
+	int err;
+
+	if (saddr)
+		fl.fl4_src = saddr->a4;
+
+	err = __ip_route_output_key(&init_net, &rt, &fl);
+	dst = &rt->u.dst;
+	if (err)
+		dst = ERR_PTR(err);
+	return dst;
+}
+
+static int xfrm4_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
+{
+	struct dst_entry *dst;
+	struct rtable *rt;
+
+	dst = xfrm4_dst_lookup(0, NULL, daddr);
+	if (IS_ERR(dst))
+		return -EHOSTUNREACH;
+
+	rt = (struct rtable *)dst;
+	saddr->a4 = rt->rt_src;
+	dst_release(dst);
+	return 0;
+}
+
+static struct dst_entry *
+__xfrm4_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
+{
+	struct dst_entry *dst;
+
+	read_lock_bh(&policy->lock);
+	for (dst = policy->bundles; dst; dst = dst->next) {
+		struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
+		if (xdst->u.rt.fl.oif == fl->oif &&	/*XXX*/
+		    xdst->u.rt.fl.fl4_dst == fl->fl4_dst &&
+		    xdst->u.rt.fl.fl4_src == fl->fl4_src &&
+		    xdst->u.rt.fl.fl4_tos == fl->fl4_tos &&
+		    xfrm_bundle_ok(policy, xdst, fl, AF_INET, 0)) {
+			dst_clone(dst);
+			break;
+		}
+	}
+	read_unlock_bh(&policy->lock);
+	return dst;
+}
+
+static int xfrm4_get_tos(struct flowi *fl)
+{
+	return fl->fl4_tos;
+}
+
+static int xfrm4_init_path(struct xfrm_dst *path, struct dst_entry *dst,
+			   int nfheader_len)
+{
+	return 0;
+}
+
+static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev)
+{
+	struct rtable *rt = (struct rtable *)xdst->route;
+
+	xdst->u.rt.fl = rt->fl;
+
+	xdst->u.dst.dev = dev;
+	dev_hold(dev);
+
+	xdst->u.rt.idev = in_dev_get(dev);
+	if (!xdst->u.rt.idev)
+		return -ENODEV;
+
+	xdst->u.rt.peer = rt->peer;
+	if (rt->peer)
+		atomic_inc(&rt->peer->refcnt);
+
+	/* Sheit... I remember I did this right. Apparently,
+	 * it was magically lost, so this code needs audit */
+	xdst->u.rt.rt_flags = rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST |
+					      RTCF_LOCAL);
+	xdst->u.rt.rt_type = rt->rt_type;
+	xdst->u.rt.rt_src = rt->rt_src;
+	xdst->u.rt.rt_dst = rt->rt_dst;
+	xdst->u.rt.rt_gateway = rt->rt_gateway;
+	xdst->u.rt.rt_spec_dst = rt->rt_spec_dst;
+
+	return 0;
+}
+
+static void
+_decode_session4(struct sk_buff *skb, struct flowi *fl, int reverse)
+{
+	struct iphdr *iph = ip_hdr(skb);
+	u8 *xprth = skb_network_header(skb) + iph->ihl * 4;
+
+	memset(fl, 0, sizeof(struct flowi));
+	if (!(iph->frag_off & htons(IP_MF | IP_OFFSET))) {
+		switch (iph->protocol) {
+		case IPPROTO_UDP:
+		case IPPROTO_UDPLITE:
+		case IPPROTO_TCP:
+		case IPPROTO_SCTP:
+		case IPPROTO_DCCP:
+			if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
+				__be16 *ports = (__be16 *)xprth;
+
+				fl->fl_ip_sport = ports[!!reverse];
+				fl->fl_ip_dport = ports[!reverse];
+			}
+			break;
+
+		case IPPROTO_ICMP:
+			if (pskb_may_pull(skb, xprth + 2 - skb->data)) {
+				u8 *icmp = xprth;
+
+				fl->fl_icmp_type = icmp[0];
+				fl->fl_icmp_code = icmp[1];
+			}
+			break;
+
+		case IPPROTO_ESP:
+			if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
+				__be32 *ehdr = (__be32 *)xprth;
+
+				fl->fl_ipsec_spi = ehdr[0];
+			}
+			break;
+
+		case IPPROTO_AH:
+			if (pskb_may_pull(skb, xprth + 8 - skb->data)) {
+				__be32 *ah_hdr = (__be32*)xprth;
+
+				fl->fl_ipsec_spi = ah_hdr[1];
+			}
+			break;
+
+		case IPPROTO_COMP:
+			if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
+				__be16 *ipcomp_hdr = (__be16 *)xprth;
+
+				fl->fl_ipsec_spi = htonl(ntohs(ipcomp_hdr[1]));
+			}
+			break;
+		default:
+			fl->fl_ipsec_spi = 0;
+			break;
+		}
+	}
+	fl->proto = iph->protocol;
+	fl->fl4_dst = reverse ? iph->saddr : iph->daddr;
+	fl->fl4_src = reverse ? iph->daddr : iph->saddr;
+	fl->fl4_tos = iph->tos;
+}
+
+static inline int xfrm4_garbage_collect(struct dst_ops *ops)
+{
+	xfrm4_policy_afinfo.garbage_collect();
+	return (atomic_read(&xfrm4_dst_ops.entries) > xfrm4_dst_ops.gc_thresh*2);
+}
+
+static void xfrm4_update_pmtu(struct dst_entry *dst, u32 mtu)
+{
+	struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
+	struct dst_entry *path = xdst->route;
+
+	path->ops->update_pmtu(path, mtu);
+}
+
+static void xfrm4_dst_destroy(struct dst_entry *dst)
+{
+	struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
+
+	if (likely(xdst->u.rt.idev))
+		in_dev_put(xdst->u.rt.idev);
+	if (likely(xdst->u.rt.peer))
+		inet_putpeer(xdst->u.rt.peer);
+	xfrm_dst_destroy(xdst);
+}
+
+static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
+			     int unregister)
+{
+	struct xfrm_dst *xdst;
+
+	if (!unregister)
+		return;
+
+	xdst = (struct xfrm_dst *)dst;
+	if (xdst->u.rt.idev->dev == dev) {
+		struct in_device *loopback_idev =
+			in_dev_get(dev_net(dev)->loopback_dev);
+		BUG_ON(!loopback_idev);
+
+		do {
+			in_dev_put(xdst->u.rt.idev);
+			xdst->u.rt.idev = loopback_idev;
+			in_dev_hold(loopback_idev);
+			xdst = (struct xfrm_dst *)xdst->u.dst.child;
+		} while (xdst->u.dst.xfrm);
+
+		__in_dev_put(loopback_idev);
+	}
+
+	xfrm_dst_ifdown(dst, dev);
+}
+
+static struct dst_ops xfrm4_dst_ops = {
+	.family =		AF_INET,
+	.protocol =		__constant_htons(ETH_P_IP),
+	.gc =			xfrm4_garbage_collect,
+	.update_pmtu =		xfrm4_update_pmtu,
+	.destroy =		xfrm4_dst_destroy,
+	.ifdown =		xfrm4_dst_ifdown,
+	.local_out =		__ip_local_out,
+	.gc_thresh =		1024,
+	.entry_size =		sizeof(struct xfrm_dst),
+	.entries =		ATOMIC_INIT(0),
+};
+
+static struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
+	.family = 		AF_INET,
+	.dst_ops =		&xfrm4_dst_ops,
+	.dst_lookup =		xfrm4_dst_lookup,
+	.get_saddr =		xfrm4_get_saddr,
+	.find_bundle = 		__xfrm4_find_bundle,
+	.decode_session =	_decode_session4,
+	.get_tos =		xfrm4_get_tos,
+	.init_path =		xfrm4_init_path,
+	.fill_dst =		xfrm4_fill_dst,
+};
+
+static void __init xfrm4_policy_init(void)
+{
+	xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
+}
+
+static void __exit xfrm4_policy_fini(void)
+{
+	xfrm_policy_unregister_afinfo(&xfrm4_policy_afinfo);
+}
+
+void __init xfrm4_init(void)
+{
+	xfrm4_state_init();
+	xfrm4_policy_init();
+}
+